Grow Streptocarpella in a well-drained organic potting mix in a window box or hanging basket. They do great outdoors for much of the year in zone seven, but must be brought indoors to protect them from frost.
Streptocarpella prefers bright light, but can be damaged by too much direct sunlight. The leaves may also be damaged by near-frost conditions, or very cold rain, if left outdoors too late in the fall.
Streptocarpella blooms almost continuously, even through the winter as a houseplant if given plenty of light, as in a south or east-facing window. Although not a heavy feeder, it will grow and flower best if fertilized periodically.
As for the yellowing of the leaves, as the weather gets colder, make sure that it isn't any cold drafts or by heat ducts, these conditions can cause the plant to yellow. Also, make sure not to get water on the leaves because it can cause yellow spottining on the leaves. Finally, if it isn't these, check the plants for insects. Remember insects can be very small and difficult to see and can easily cause the plant to quickly yellow.
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Earl May Nursery and Garden Center in Ames, Iowa
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